| 摘要 |
Total synthesis of steroids with substitution in the 2,3, 6, 11 or 17 positions comprising the step of cyclization of a compound having the formula <IMAGE> (1) <IMAGE> (1A) or analogues thereof, where X represents =O, <IMAGE> or beta -substituted <IMAGE> Y represents =O, beta -oriented <IMAGE> or beta -orientated OH, R' and R2 may be the same or different and R' represents alkyl or aryl and R2 represents alkyl and Z represents ether or hindered ester to form the novel compounds <IMAGE> (2) <IMAGE> (2A)
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